Magnetostriction insensitive dual‐mode phase shifter

Abstract

AbstractThe dual‐mode phase shifter is known as a reciprocal ferrite phase shifter. However, in the dual‐mode phase shifter made of ferrite with magnetostrictive effect such as YIG for high power and low insertion loss applications, the reciprocal characteristics of the insertion phase shift is degraded when an external force is applied. This paper shows theoretically and experimentally that this nonreciprocal insertion phase shift is caused by the circumferential magnetization in the Faraday rotator known as the inverse Wiedemann effect, one of the magnetostrictive effects. The paper describes a method for constructing a dual‐mode phase shifter in which the nonreciprocal insertion phase is cancelled and summarizes the results of the trial fabrication. In the dual‐mode phase shifter cancelling the non‐reciprocal insertion phase developed for the X band application, the nonreciprocal insertion phase shift is less than 2 degrees, that is, one‐tenth that in a conventional device made of identical material.